<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><title>Help - Sentinel-1</title>





<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<link rel="stylesheet" href="../style.css"></head><body>
<table class="header">
<tbody>
<tr class="header">
<td class="header">&nbsp; Azimuth Shift<br>
</td>
<td class="header" align="right"><a href="../general/Overview.html"><img src="../images/snap_header.jpg" border="0"></a></td>
</tr>
</tbody>
</table>
<h3>Sentinel-1 Azimuth Shift</h3>
<p class="MsoNormal"><span>This operator follows the Range Shift
operator in the TOPS InSAR processing chain. It first estimates a
global azimuth offset for the whole sub-swath of the split S-1 SLC
image using a Enhanced Spectral Diversity (ESD) method. The ESD
approach exploits the data at the overlapped area of the adjacent
bursts. The estimation is done for every overlapped area and the final
azimuth offset is obtained by averaging all the estimations.<br>
</span></p>
<p class="MsoNormal"><span>The operator then performs shift in azimuth
direction for every burst using the offset computed above with a phase
ramp method in frequency domain</span>.<br>
<span style=""></span></p>
 
<h4>Input <br>
</h4>



<ul>
<li>The input to this operator is the resulting product from the S-1 Range Shift operator. It is the co-registered master and slave images
for the same
sub-swath and same polarization (e.g. IW1 -
VV).
  </li>
</ul>

<h4>Output <br>
</h4>




<ul>
<li>The output of the operator are the co-registered master and slave
bands in I/Q format with the slave bands shifted by a small amount in azimuth direction. 

  </li>
</ul>


<h4>Parameters Used<br>
</h4>




<ul>
<li>No parameter is needed for this operator.<br>
  </li>
</ul>
<hr>
</body></html>